cranial

Etymology

It is formed from English cranium + -al,^{[2][3][4][5][6]} or, as the OED puts it, from the medieval or modern Latin word with the English suffix.^[7] Cranium is from Medieval Latin crānium, from Ancient Greek κρανίον (kraníon, “skull”),^[7][2][8] which is related to κάρα (kára, “head”).^[2][8][9] Etymonline takes the Greek family from Proto-Indo-European *ker- (“horn; head”),^[8] and Klein relates it to cerebrum (“brain”), the source of cerebral.^[9][10]

Earliest recorded meaning

Pertaining to the skull or cranium: 1800, in the Medical and Physical Journal.^[7][3][2] Etymonline dates the word to 1779,^[8] and Dictionary.com to 1790–1800.^[11]

Semantic evolution

The OED notes that, strictly, the word refers to the cranium proper, the brain-case, as in cranial bones.^[7] Merriam-Webster also records an anatomical sense, "toward the head", the same as cephalic.^[3] Among its fixed phrases are cranial nerve, for each of the twelve pairs of nerves that leave the brain directly, and cranial index, the ratio of a skull's width to its length.^[4][7] The adverb cranially is recorded from 1866.^[12]

Timeline

• 1800 – pertaining to the skull or cranium.^[7][3][2] Etymonline dates the word to 1779.^[8]

Meanings

Adjective

1. Of or relating to the skull.^[13][3][7]
2. Strictly, of the cranium proper, the brain-case.^[3][7]
3. (anatomy) Situated toward the head; cephalic.^[3]
4. cranial nerve: any of the twelve pairs of nerves that arise directly from the brain.^[4]
5. cranial index: the ratio of the width of the skull to its length, usually as a percentage.^[4][7]

Word family

• cranially
• postcranial
• subcranial
• intracranial
• extracranial
• dolichocranial
• intercranial
• precranial

Related words

• cranium
• cerebral

References

1. ^ Wiktionary, the free dictionary, https://en.wiktionary.org
2. ^ a b c d e Barnhart, Robert K. (1988), The Barnhart Dictionary of Etymology
3. ^ a b c d e f g Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
4. ^ a b c d Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press
5. ^ Stevenson, Angus, ed. (2010), Oxford Dictionary of English, 3rd ed., Oxford: Oxford University Press
6. ^ The American Heritage Dictionary of the English Language (online 2024), 5th ed., Boston: Houghton Mifflin Harcourt
7. ^ a b c d e f g h i Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
8. ^ a b c d e Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
9. ^ a b Klein, Ernest. A Comprehensive Etymological Dictionary of the English Language. 2 vols. Amsterdam: Elsevier, 1966–1967.
10. ^ Partridge, Eric (1966), Origins: A Short Etymological Dictionary of Modern English, 4th ed., London: Routledge & Kegan Paul
11. ^ Dictionary.com Unabridged (2016), based on the Random House Unabridged Dictionary, New York: Random House
12. ^ Simpson, J. A.; Weiner, E. S. C., eds. (1989), The Oxford English Dictionary, 2nd ed., Oxford: Clarendon Press
13. ^ Collins English Dictionary (2023), Glasgow: HarperCollins